JPS6056690A - Mounting structure of rear fork for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention provides a [Pururi A7 flat A-retrieval device] for motorcycles.
Regarding structure.

In recent years, various improvements have been attempted and adopted in rear wheel suspension systems using link type progressive suspensions with the aim of further improving performance and reducing weight. In the case of a rear suspension (hereinafter referred to as swing arm 1) in the current type progressive suspension as shown in Fig. 1, its front end is pivoted to the pivot shaft 2 of the vehicle body, and its rear end is connected to the rear wheel 4 by an axle 3. It has a structure in which it is attached and swings around the pivot 1 to the shaft 2 as fulcrums by the vertical stroke of the rear wheel 4.

The swing arm 1 and the cushion unit 5 with a built-in oil damper are connected to each other via two link members 6 and 7 as shown in the figure. is rotatably supported by a pin 9 to a bracket 8 fixed to the lower part of the swing arm 1, and its other end is also pivotally supported to the lower operating end of the cushion unit 5 by a pin 10. The second link 7 in use has one end pivoted to the vehicle body side with a pin 12, and the other end pivoted to the first link 6 with a pin 11. is a pin 9.10 between the swing arm 1, the cushion unit 5, and the second link 7.
．． 11, and the relationship between all these members forms a link Ia4Ft that can rotate with respect to each other.

Therefore, when the swing arm 1 swings due to the above mechanism, that is, when the rear wheel 4 sinks, the pivot shaft 2 of the swing arm 1 is rotated counterclockwise in the figure J as the swing arm. Along with the movement, the first link 6 pulls up the second link 7, the cushions 1 to 5, and by pushing up the first link 6, the cushion unit 5
It operates and functions as a so-called shock absorber.

However, in the above structure and function, the connection between the swing arm 1 and the first link 6 is currently forced through the interposition of the bracket 8 due to the connection with the peripheral part (A). ing.

Therefore, the present invention provides j1! to the conventional structure as described above. The purpose was to remove the bracket 8 to make it lighter and smaller, and to achieve more effective functions.
The purpose of this invention is to provide a mounting structure.

Therefore, the present invention is characterized by the following structure. In other words, it relates to the first and second link members that connect the swing arm that becomes the rear fork and the cushion unit, and the first link member has its one end connected to the pivot point of the opposite wing arm - the center that connects the shaft part and the axle part. It is pivoted on or near the axis, and the other end is pivoted to the lower working end of the cushion unit. On the other hand, the second link member has one end thereof pivoted to the vehicle body side and the other end thereof pivoted to the first link member.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure of an embodiment of the present invention will be described in detail based on the accompanying drawings. In addition, among the attached symbols marked with "I" in Figure 1, those that have the same meaning are the same as the first member. 2 and 3, reference numeral 13 indicates a cushion arm which is the first link member, and the upper end of the arm 13 is located on -A to the central axis of the swing arm 1 or slightly as shown in the figure. It is rotatably supported by a connecting pin 14 near the lower side, and the lower end is connected to the lower operating end 5a of the cushion unit 5 with a connecting pin 1.
5, it is rotatably supported. On the other hand, one end of the cushion controller 16, which is connected to the second link member, is fixed to a bin 17 on the vehicle body side near the main stand (see Figure 1).
The other end of the cushion arm 13 is rotatably supported by a C-connection pin 18 approximately in the middle of the cushion arm 13.

Next, the support 4 structure for the swing arm 1 by the bottle 1/l of the cushion arm 13 is J, which is shown in FIG. The cross member 19 is used as a support bracket, and is rotatably supported on the rest portion 4A19 via an arm collar 20 and a bearing 21. 1/+4 in the figure. This is the bolt shaft as the L rotation pin. Also shown are 22G and L seals and packing members.

The rotation locus of the connecting pin 1/1.15.18, which rotatably supports each member of the link mechanism having a grooved bottom as described above, is shown in FIG. According to this, the connection point between the cushion arm 13 and the swing arm 1 is the central axis A.
- The meaning of being provided on or in the very vicinity of A is the rotation locus line (I>, 1I
I) The separation ratio is reduced compared to the conventional mechanism, thereby increasing the degree of design freedom for progressive suspension characteristics.

That is, when the swing arm 1 sinks, the distance between the connecting pin 14 and the connecting pin 18 increases relatively, and the rotation locus line (I) of the connecting pin 14 and the rotation locus line (U) of the connecting pin 18 increase. ) gradually separate from each other, and this is due to the ratio between the stroke amount due to the sinking of the axle 3 (see Figure 1) and the amount of contraction of the constant cushion spring built into the cushion unit, that is, the normal suspension characteristics are relatively It means increasing, and the cushion unit 5
The so-called effect is weak at the beginning, and as a strong external force acts, the progressive effect of the spring increases. Therefore, the ability to reduce the separation ratio of the rotation locus lines as in the present invention increases the degree of design freedom in setting the progressive effect. Furthermore, the link member 73°/l is positioned entirely higher than in the past, and the number of protrusions around the bottom of the vehicle can be reduced.

As is clear from the above description, if the present invention is applied to a rear fork mounting structure known as a link type progressive suspension system 131 (4), its effectiveness will be significantly demonstrated. , Sub) 1f, by removing the support brown 1 ~ of the cushion arm such as the mold, and by raising the connecting point of the cushion arm to the rear fork on or near the rear fork center axis ( It becomes possible to utilize the reinforcing cross section of the lateral cushion arm as a supporting member of the side cushion arm.As a result, the number of members is reduced, the weight and size are reduced, and the degree of freedom in setting the function called the progressive effect is increased. Increasing is 'C'.

[Brief explanation of the drawing]

Fig. 1 is a partial side view of a motorcycle equipped with a conventional luff A-trimmed ("J' JM 3u"), and Figs. It is a diagram, a partial cross-sectional view seen from above, and an action diagram showing the rotation locus of each connection point as a link mechanism. Explanation of symbols of main parts 1... Swing arm 2... - Pivot shaft 3... Axle 4... Rear wheel 5... Cushion unit 6.13... Cushion arm 7.16 as the first link member. ...Cushion connecting rod 8 as a second link member ...Cushion arm support brackets 1 to 14
．． 15.18...Connecting pin A-A line...
・Center of swing arm lll1ll\A19...
...Cross member 20...Cushion arm collar 21...
...Bearing Applicant: Honda Motor Co., Ltd. Agent: Motohiko Fujimura, Patent Attorney: Figure 2, Figure 3

Claims (1)

[Claims] The structure is such that the rocking motion of the motorcycle body is transmitted to the cushion unit, and one end is attached to the cushion unit. a first link member that is pivoted on or near the center axis of the fork and whose other end is pivoted to the lower operating end of the cushion unit; 1. A rear fork mounting structure for a motorcycle, comprising: a second link member which is supported and whose other end is pivotally supported on the vehicle body side.